Charles A. Sennewald, CMC, CPP, CSC is an independent security management consultant.  He has been the Director of Security for Broadway Department Store, Chief of Security for the Claremont Colleges and a deputy sheriff with the Los Angeles County Sheriff’s Department.  Additionally, Charles Sennewald is the founder and first president of the International Association of Professional Security Consultants (IAPSC),  a graduate of the California State University at Los Angeles and the U.S. Army's Military Police School.  Charles Sennewald is the author of six books: Effective Security Management; The Process of Investigation; Security Consulting; Shoplifters vs. Retailers: The Rights of Both; Shoplifting: Managing the Problem; and, The Last Volkswagen.

According to the book description of The Process of Investigation, it “is a book written to address the needs of the private investigator in the security field. Continuing in the tradition of its previous editions, this book covers essential topics which are often overlooked in works that concentrate on the public aspects of investigation. Investigative skills such as surveillance techniques, interviewing and interrogation, evidence, and confessions and written statements are all discussed, and supplemented with updated case studies and examples from the authors own experiences.

Major revisions to The Process of Investigation include mention and coverage of the effects of 9/11 on the security industry, the need to incorporate awareness of terrorism and terrorist activities when investigating any suspicious behavior, and two completely new chapters. Chapter 10 discusses interviewing and interrogations, and is written by Doug Wicklander and Dave Zulawski, premier experts in the field. Chapter 23 addresses the issues of workplace violence, and includes coverage of stalking, domestic violence spillover into workplaces, red flags, and the Theory of Threat Assessment and Management (TAM), among other topics. Additionally, other more minor modifications in legislation that have been passed and implemented since the last edition are addressed throughout the book.”

Charles Sennewald, the author, expanded his horizons as an author by penning the Last Volkswagen, a fictional, often comedic tale.  According to the book description, “Competition with foreign products, having adverse effects on American labor, brings about a major political climate, and government. The new pro-labor congress out-laws the importation of foreign goods, including automobiles. Detroit and other industrial centers are reinvigorated and the economy booms. Growing economic success prompts new legislation, which mandates that all foreign-made autos must be exchanged on a government funded trade-in program within a specified three (3) year period. A new powerful regulatory and investigative agency, the Division of Import Controls (DIC) is created to enforce the new law. At the end of the 3 year period possession of a foreign car is a federal crime. In our story the government’s investigative efforts to rid the streets and highways of foreign cars has been achieved..except for one: a 1963 Volkswagen "beetle". This story focuses on the chief of the DIC and his dedication and commitment to locate and seize this last unaccounted-for car and a rancher in Nebraska who is equally determined they will never find it. It’s a fascinating journey leading to a clash of two very different kind of "giants", with unexpected results.”